lorry: Avoid creating non-bare repository in gitify_svn

Our working repositories should always be initialised as bare, and
this should be done in one place.  gitify_svn currently uses "git svn
init", which always creates a non-bare repository, and then modifies
the repository to be bare (though still with core.logallrefupdates
enabled).

Thankfully "git svn init" does very little beyond "git init", so
we can avoid this:

1. Call ensure_gitdir, like other gitify methods do
2. Create the directory svn/refs/remotes/git-svn
3. Set config parameters svn-remote.svn.url (which we already did) and
   svn-remote.svn.fetch

1 files changed, 16 insertions, 18 deletions

diff --git a/lorry b/lorry
index 59d8296..524ed2c 100755
--- a/lorry
+++ b/lorry
@@ -479,7 +479,7 @@ class Lorry(cliapp.Application):
 
         if active_count == 0:
             # We can't create the repo here because "git cvsimport"
-            # and "git svn init" insist on doing so themselves
+            # insists on doing so itself
             return temp_repo, None, 1
 
         self.copy_gitdir(active_repo, temp_repo)
@@ -621,24 +621,22 @@ class Lorry(cliapp.Application):
             layout = { "trunk": "trunk",
                        "tags": "tags/*",
                        "branches": "branches/*" }
-        if not os.path.exists(gitdir):
-            self.progress('.. doing initial clone')
-            self.needs_aggressive = True
-            self.run_program(['git', 'svn', 'init', spec['url'], gitdir + "-tmp",
-                              '--svn-remote=svn', '--no-minimize-url'])
-            os.rename(os.path.join(gitdir + "-tmp", '.git'), gitdir)
-            os.rmdir(gitdir + "-tmp")
-            self.run_program(['git', 'config', 'core.bare', 'true'],
-                             cwd=gitdir)
-        else:
-            self.progress('.. updating existing clone')
 
-            # Force URL to the one in the Lorry spec. This way, if the
-            # URL in the spec changes, Lorry accepts the change rather
-            # than using the original one.
-            self.run_program(
-                ['git', 'config', 'svn-remote.svn.url', spec['url']],
-                cwd=gitdir)
+        # We should not run "git svn init" which creates a non-bare
+        # repository.  Instead, create the directory and extra config
+        # parameters that it would create.  This also ensures that if
+        # the URL in the spec changes, Lorry accepts the change rather
+        # than using the original one.
+        self.needs_aggressive = self.ensure_gitdir(gitdir)
+        os.makedirs(os.path.join(gitdir, 'svn/refs/remotes/git-svn'),
+                    exist_ok=True)
+        self.run_program(
+            ['git', 'config', 'svn-remote.svn.url', spec['url']],
+            cwd=gitdir)
+        self.run_program(
+            ['git', 'config', 'svn-remote.svn.fetch', ':refs/remotes/git-svn'],
+            cwd=gitdir)
+
         # manually set the refspecs to fetch into local
         # git-svn can apparently provide better history tracking by
         # fetching the root of the repository